Chemistry · Science General

Separation Techniques

842 Questions

Separation techniques involve physical methods to isolate mixtures, including distillation, filtration, and crystallization. Competitive exams frequently test these foundational concepts. Review the exact processes to enhance problem solving speed.

Distillation and evaporationCrystallization processFiltration methodsSeparating dissolved solidsChromatography and mass techniques

Separation Techniques Questions

Multiple choice

Which method is used in dairies to separate cream from milk?

  1. Churning

  2. Decantation

  3. Loading

  4. Filtration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Churning refers to rotating a mixture at a high speed so that the lighter particles come at the surface and the heavier particles settle down. This method is used to separate cream from milk as cream being lighter comes to the surface and milk being heavier settles down. 

Multiple choice

Which of the following statements is incorrect?

  1. Butter is taken out by churning milk.

  2. Harvesting separates grains from stalk.

  3. Stones cannot be separated from rice by hands.

  4. Tea leaves are separated with a strainer from liquid.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Churning of curd separates the butter; as butter is lighter. Tea leaves are big enough and can be easily separated using strainer. Also, stones are bigger in size than rice grains so they can be easily separated by hand picking. 

Multiple choice

Which method is used in dairies to separate cream from milk?

  1. Churning

  2. Filtration

  3. Evaporation

  4. Boiling
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Churning refers to rotating a mixture at a high speed so that the lighter particles come at the surface and the heavier particles settle down. This method is used to separate cream from milk as cream being lighter comes to the surface and milk being heavier settles down. 

Multiple choice

Winnowing is a method for separating ___________.

  1. heavier and lighter components

  2. larger impurities

  3. components of different sizes

  4. impurities from water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Winnowing is a method in which the heavier particles are separated from the lighter ones due to the difference in their weight. Separation of husk from grains is done using this method. 

Multiple choice

The process of settling down of a solid in a liquid is called

  1. centrifugation

  2. sedimentation

  3. decantation

  4. filtration
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A solid substance is not soluble and is heavier than the liquid. It will settle down at the bottom and the process is known as sedimentation. This process is helpful in removing impurities e.g. dust particles from rice as rice being heavier settle down and dust being lighter stays at the surface and can be easily removed.